A089873 - OEIS

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A089873

Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A071665/A071666.

1, 1, 2, 2, 2, 4, 4, 4, 10, 6, 10, 12, 16, 20, 36, 28, 56, 46, 104, 84, 166 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	COMMENTS	`The number of n-node binary trees fixed by the corresponding automorphism(s).`
	LINKS	`Table of n, a(n) for n=0..20.` `A. Karttunen, C-program for computing the initial terms of this sequence`
	CROSSREFS	`Sequence in context: A180019 A112801 A173862 * A096323 A035682 A054543` `Adjacent sequences: A089870 A089871 A089872 * A089874 A089875 A089876`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen, Nov 29 2003`
	STATUS	`approved`

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Last modified May 18 19:33 EDT 2013. Contains 225426 sequences.